The man in the footage is described as slim, approximately 5ft 10ins tall wearing a dark jacket, dark trousers a red woolly hat.

A 37-year-old man has already been arrested in connection with the incident and has been bailed to a date in early January pending further enquiries.

Detective Chief Inspector Will Young, Kensington and Chelsea said: "This is an ongoing investigation involving a number of lines of enquiry and we are actively following all leads in an effort to identify the suspect concerned. A man has already been arrested in connection with this incident and is currently on police bail.

"The occupants were unharmed during the incident but understandably are shaken by what happened and are keen to recover all of the items that were stolen which are of sentimental value."

Anyone who has information about the incident should call Kensington and Chelsea CID on 020 8246 0137 or Crimestoppers anonymously on 0800 555 111.